Duplex

Duplex stainless steels are magnetic and are far more corrosion resistant than more commonly used stainless grades, ie 302 and 316.

Duplex is also known as Duplex 2205 and Cronifer 2205 LCN.

ISO 15156-3
(NACE MR 0175)
W.Nr 1.4462
UNS S31803
2205
AWS 167
Greater corrosion resistance than stainless steel 300 series.
Greater pitting resistance and uniform corrosion resistance to stress corrosion cracking than stainless steel 300 series.
Good weldability.
Chemical processing.
Oil and gas refining.
Marine environments.
Pollution control equipment.
Specifications
ISO 15156-3
(NACE MR 0175)
W.Nr 1.4462
UNS S31803
2205
AWS 167
Greater corrosion resistance than stainless steel 300 series.
Greater pitting resistance and uniform corrosion resistance to stress corrosion cracking than stainless steel 300 series.
Good weldability.
Chemical processing.
Oil and gas refining.
Marine environments.
Pollution control equipment.

Chemical Composition

Element Min % Max %
C – 0.03
Si – 1.00
Mn – 2.00
P – 0.035
S – 0.015
Cr 21.00 23.00
Ni 4.50 6.50
Mo 2.50 3.50
N 0.10 0.22

Density

7.8 g/cm³ | 0.282 lb/in³

Melting Point

1470°C | 2680°F

Coefficient of Expansion

13.7 μm/m °C (21 – 100°C) | 7.610 x 10-6 in/in °F (70 – 212°F)

Modulus of Elasticity

200 kN/mm² | 29008 ksi

Modulus of Rigidity

76.9 kN/mm² | 11154 ksi

Add Row Heat Treatment of Finished Parts

Condition as supplied by Alloy Wire Type Temperature Time (Hr) Cooling
°C °F
Annealed or Spring Temper Stress Relieve 250 480 1 Air

Properties

Condition Approx. tensile strength Approx. operating temperature
N/mm² ksi °C °F
Solution Annealed < 1000 < 145 -200 to +300 -330 to +570
Spring Temper 1300 – 1900 189 – 276 -200 to +300 -330 to +570
The above tensile strength ranges are typical. If you require different please ask.